Preparation of water-insoluble carboxymethyl cellulose absorbents
US4200736A · kind A · utility
11Cited by
6References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 17, 1978 |
| Grant date | Apr 29, 1980 |
| Priority date | — |
| Expiry date | May 17, 1998 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61L15/28
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A process for the preparation of a substantially water-insoluble, particulate sodium salt of carboxymethyl cellulose, suitable for use as an absorbent in tampons and other catamenial devices or the like. The process involves heating solid, water-soluble sodium carboxymethyl cellulose, having a degree of substitution of at least 0.4, with carbon dioxide gas to substantially insolubilize the carboxymethyl cellulose and convert it to a form suitable for absorbent applications.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.